Dependence of pulse duration on parameters of medium in stimulated Brillouin scattering

Stimulated Brillouin Scattering (SBS) is a process to product the phase conjugated light. Now it is being pursued as a means for pulse compression, beam combination and wave-front reversal. To achieve a high quality short pulse beam, to select a proper medium is very important. The effect of parameters of Brillouin mediums on pulse compression of Stimulated Brillouin Scattering process used as a SBS generator are shown theoretically and experimentally. The theoretical model includes transient process, absorption of medium, and pump depletion. The results show that pulse compression ratio is 8 in 0.68 MPa. Dependence of pulse compression on the acoustic lifetime and Brillouin gain coefficients is investigated respectively. The results show that pulse compression versus parameters of medium has the best point, because the gain coefficients of real medium change with its acoustic lifetimes. The theoretical and experimental results are consistent.